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Recognised as Colour

#155ED3

  • #155ED3
  • Blue
  • Dark
  • Nearest: Royal blue

#155ED3 is a blue with RGB values 21, 94, 211 and HSL 217°, 82%, 45%. It is a dark colour, so white text on it reaches 5.9:1 contrast (AA for normal text). The nearest named colour is Royal blue.

Colour values

#155ED3#155ED3
HEX#155ED3
RGBrgb(21, 94, 211)
RGB (0–1)0.0824, 0.3686, 0.8275
RGB percentages8.2%, 36.9%, 82.7%
HSLhsl(216.9, 81.9%, 45.5%)
HSV / HSBhsv(216.9, 90%, 82.7%)
CMYK90%, 55.5%, 0%, 17.3%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer1,400,531
CSS custom property--colour: #155ED3;

Brightness & contrast

Relative luminance0.12868WCAG 2.x, 0 is black and 1 is white
Perceived brightness102 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 5.88:1
Contrast with white5.88:1WCAG normal text: AA
Contrast with black3.57:1WCAG normal text: Fail
Greyscale equivalent#575757
Inverted#EAA12C

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#006DD7no red cones; affects about 1% of men; ΔE 10.8 from the original
Deuteranopia#005DD1no green cones; the most common form, about 1% of men; ΔE 1.1 from the original
Tritanopia#007B8Fno blue cones; rare, and affects men and women equally; ΔE 65.3 from the original
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text5.88:1WCAG large text: AAA
Contrast with black, large text3.57:1WCAG large text: AA

Named colours

Royal blue · ΔE 5.8Slate blue · ΔE 14.8Medium slateblue · ΔE 19.6Dodgerblue · ΔE 22.1Medium purple · ΔE 23.8Dark slateblue · ΔE 26.6
Nearest named CSS colourRoyal blue (#4169E1)ΔE 5.76, clearly different but related
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#D38A15
Analogous#15BDD3, #2B15D3
Triadic#D3155E, #5ED315
Split complementary#D32B15, #BDD315
Tetradic#D315BD, #D38A15, #15D32B

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#BCD3F8
Lighter +30%#8DB5F4
Lighter +20%#5F96EF
Lighter +10%#3178EA
Darker −10%#1049A5
Darker −20%#0C3576
Darker −30%#072048
Darker −40%#030B19
More saturated +25%#0059E8
Less saturated −25%#3265B6

Channel breakdown

R21
G94
B211
Red21 (8.2%)
Green94 (36.9%)
Blue211 (82.7%)
Hue216.95°
Saturation (HSL)81.9%
Lightness45.49%
Dominant channelBlue
Hex per channelR 15 · G 5E · B D3

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Every value on this page was computed from “155ed3” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.